Very loud noise from back end. Sounds like a plane taking off?

[CD17]

I have a 2014 Sierra 5.3 V8 Z71. I’m getting a very loud groaning type noise I guess you would call it? Multiple people while riding in my truck have said it sounds like a plane taking off. It does it at all times 2WD and 4WD high and low and at all speeds. It is definitely coming from the back end of the vehicle. Any help or thoughts would be greatly appreciated.

Edited November 2, 2020 by CD17

[CamGTP]

Probably coming from the rear diff then.

[btj_z71]

1 hour ago, CD17 said:

I have a 2014 Sierra 5.3 V8 Z71. I’m getting a very loud groaning type noise I guess you would call it? Multiple people while riding in my truck have said it sounds like a plane taking off. It does it at all times 2WD and 4WD high and low and at all speeds. It is definitely coming from the back end of the vehicle. Any help or thoughts would be greatly appreciated.

I agree with the other post, sounds like a rear diff to me.

[Mike GMC]

When you say all speeds, does that include 0?  It if only happens when you are moving, then I agree, look into the rear diff.  If it also happens at a stop, then it could be something else.

[sonerick]

Wheel bearing?

[CD17]

3 hours ago, Mike GMC said:

When you say all speeds, does that include 0?  It if only happens when you are moving, then I agree, look into the rear diff.  If it also happens at a stop, then it could be something else.

Sorry. Any speed while moving.

[CD17]

To everyone that answered I appreciate the responses. A couple weeks ago I finally couldn’t take the noise anymore and couldn’t find the issues so I took my truck to the garage. $1500 later and I have new wheel bearings and a rebuilt differential and no more noise. Chunk of change I didn’t want to spend at the holiday season but my sanity was more important lol